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Barata
Joined: 31 Aug 2008
Posts: 223
Location: Ovar - Portugal
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 Posted: Sun Oct 05, 2008 12:10 am Post subject: Flektogon 25/4 problems????? |
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Barata wrote:
I've bought the lens in the title, as you know, and today, when testing, i found it very smooth in the corners.
Is this normal? Is there away to fix it?
http://i36.tinypic.com/347wwet.jpg
Besides that i dont know what's wrong with focusing to infinity... the picture below doesnt seems correctly focused...
http://i38.tinypic.com/2rhr8yw.jpg
Big pictures, around 1mb.
Thanks for any insight.
_________________
http://www.pictures-of-a-lifetime.com (now with a newsletter so you can keep track of the new pictures being added)
Body:
40D
Lenses:
AF
Sigma 18-200 F3.5-6.3 DC OS
MF
Asahi Super Takumar 50/1.4
ISCO - Gottingen - BEROLINA TELE WESTANAR 135/3.5
CZ Flektogon 25/4
WELTBLICK Auto Tele 135/2.8
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Sun Oct 05, 2008 12:19 am Post subject: |
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Orio wrote:
Some blur in the corners at wide open is normal with this lens.
There is copy variations with the Fleks but judging from these two images, yours does not seem so bad (at least to me).
I usually shoot this lens at f/8 or f/11
As for infinity focusing, it seems ok to me, but at this enlargement size it's difficult to say any conclusive word.
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Orio, Administrator
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Barata
Joined: 31 Aug 2008
Posts: 223
Location: Ovar - Portugal
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| Posted: Sun Oct 05, 2008 12:21 am Post subject: |
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Barata wrote:
These were shot at f/11 or smaller apertures
I'm so sad. 
_________________
http://www.pictures-of-a-lifetime.com (now with a newsletter so you can keep track of the new pictures being added)
Body:
40D
Lenses:
AF
Sigma 18-200 F3.5-6.3 DC OS
MF
Asahi Super Takumar 50/1.4
ISCO - Gottingen - BEROLINA TELE WESTANAR 135/3.5
CZ Flektogon 25/4
WELTBLICK Auto Tele 135/2.8
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Sun Oct 05, 2008 12:27 am Post subject: |
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Orio wrote:
No problem, resell the lens, you will get your money back.
Anyway maybe I am too forgiving, but I fail to see this enormous corner problem that you mention.
_________________
Orio, Administrator
T*
NE CEDE MALIS AUDENTIOR ITO
Ferrania film is reborn! http://www.filmferrania.it/
Support the Ornano film chemicals company and help them survive!
http://forum.mflenses.com/ornano-chemical-products-t55525.html |
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Barata
Joined: 31 Aug 2008
Posts: 223
Location: Ovar - Portugal
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| Posted: Sun Oct 05, 2008 12:31 am Post subject: |
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Barata wrote:
In the first picture it's very distinct on the boat and the cart more to the right.
At the center, this lens is beautifull... i just get the creeps when i go and check the corners! It makes my eyes sad and heart break.
_________________
http://www.pictures-of-a-lifetime.com (now with a newsletter so you can keep track of the new pictures being added)
Body:
40D
Lenses:
AF
Sigma 18-200 F3.5-6.3 DC OS
MF
Asahi Super Takumar 50/1.4
ISCO - Gottingen - BEROLINA TELE WESTANAR 135/3.5
CZ Flektogon 25/4
WELTBLICK Auto Tele 135/2.8
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estudleon
Joined: 15 May 2008
Posts: 3754
Location: Argentina
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| Posted: Sun Oct 05, 2008 1:58 am Post subject: |
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estudleon wrote:
I see you pics as you saw this. My 20/4 Flekt produce similar pics, may be something less sharp at center, but very closely. And with this corners as your lens do.
_________________
Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
Pentax S-M-C-1,4/50
Helios 44-3
Mamiya 2,8/135
Misc. : jupiter 9
Stuff used:
A) SRL
Alpa 10 D - kern macro Switar 1,9/50 -black, Kilffit apochromat 2/100.
Asahi pentax spotmatic super takumar 1,4/50
Contaflex super B tessar 2,8/50 Pro-tessar 115
Leica R3 electronic summicron 2/50 elmarit 2,8/35
Konica Autoreflex 3 (2 black and chrome one), TC, T4. 2,8/24, 3,5/28 not MC and MC, 1,8/40, 1,4/50, 1,7/50 MC and not MC, 1,8/85, 3,2/135, 3,5/135, 4/200
Minolta XG9 2,8/35, 2/45, 3,5/135
Nikkormat FTn 1,4/50, 2,8/135
Fujica ST 801, 605, 705n. 3,5/19, 1,4/50, 1,8/55, 4/85, 3,5/135.
Praktica MTL 5 and a lot of M42 lenses.
Voigtlander. Bessamatic m, bessamatix de luxe, bessamatic cs, ultramatic and ultramatic cs.
Skoparex 3,5/35, skopagon 2/40, skopar 2,8/50, skopar X 2,8/50, super lanthar (out of catalogue) 2,8/50, dinarex 3,4/90, dinarex 4,8/100, super dinarex 4/135, super dinarex 4/200, zoomar 2,8/36-83, portrait lens 0, 1 and 2. Curtagon 4/28 and 2,8/35
Canon AV1, 1,8/50
Rolleiflex SL35 and SL35 E. 2,8/35 angulon, 2,8/35 distagon, 1,4/55 rolleinar, 1,8/50 planar, 4/135 tessar, 2,8/135 rolleinar, x2 rollei, M42 to rollei adap.
Etc.
RF
Yashica Minister III
Voightlander Vito, vitomatic I, Vito C, etc.
Leica M. M2, M3 (d.s.) and M4. Schenider 3,4/21, 2/35 summaron 2,8/35 (with eyes). Summicron 2/35 (8 elements with eyes), 2/35 chrome, 2/35 black, 1,4/35 pre asph and aspheric - old -, 2/40 summicron, 2,8/50 elmar, 2/50 7 elements, 2/50 DR, 2/50 - minolta version, 1,4/50 summilux 1966 version, 1,4/75 summilux, 2/90 large version, 2/90 reduced version of 1987, 2,8/90 elmarit large version, 4/135 elmar. |
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Barata
Joined: 31 Aug 2008
Posts: 223
Location: Ovar - Portugal
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| Posted: Sun Oct 05, 2008 3:06 am Post subject: |
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Barata wrote:
I guess it's a good macro lens then... 
_________________
http://www.pictures-of-a-lifetime.com (now with a newsletter so you can keep track of the new pictures being added)
Body:
40D
Lenses:
AF
Sigma 18-200 F3.5-6.3 DC OS
MF
Asahi Super Takumar 50/1.4
ISCO - Gottingen - BEROLINA TELE WESTANAR 135/3.5
CZ Flektogon 25/4
WELTBLICK Auto Tele 135/2.8
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Laurence
Joined: 26 Mar 2007
Posts: 4809
Location: Western Washington State
Expire: 2016-06-19
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| Posted: Sun Oct 05, 2008 4:05 am Post subject: |
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Laurence wrote:
I definitely have fall-off at the corners with the Flek 25/4. I just try to work around it, and keep the aperture at f:8 and above whenever possible.
_________________
Assent, and you are sane;
Demur,—you ’re straightway dangerous,
And handled with a chain.
Emily Dickinson
Cameras and Lenses in Use:
Yashica Mat 124 w/ Yashinon 80/3.5,
CV Apo-Lanthar 90/3.5SL, (Thank you Klaus),
Pentax 645,
Flek 50,
Pentax-A 150
Pentax-A 120 Macro
Voigtlander Vitomatic I w/Color Skopar 50/2.8
Konica TC and zoom lenses (thanks Carsten)
Contax AX
Yashica ML 50/2
Yashica ML 35/2.8
Carl Zeiss Contax 50/1.4
Tamron Adaptall SP 17/3.5
Tamron Adaptall 28/2.5
Tamron Adaptall SP 300/2.8 LD (IF)
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Barata
Joined: 31 Aug 2008
Posts: 223
Location: Ovar - Portugal
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| Posted: Sun Oct 05, 2008 12:53 pm Post subject: |
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Barata wrote:
Well, shots were made at f/11 and beyhond.
I'll try f/22 
From another forum:
| FTL wrote: |
Well, both of the 20 & 25 f4.0 lens are soft at the corner. The 2.8 is marginally better but its corner won;t really be termed sharp unless you stopped down way to 11 and the subject is not really close up. In a sense they exhibit very classic wide angle lens render, with a heavy degrading of image quality once abotu 1/2 out from center, and once you got to 2/3 off center, you can really tell ( even when stopped down )
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Oh God... it seems i bought a macro lens. (this is why: http://forum.mflenses.com/flektogon-25-4-test-shots-t11237.html )
_________________
http://www.pictures-of-a-lifetime.com (now with a newsletter so you can keep track of the new pictures being added)
Body:
40D
Lenses:
AF
Sigma 18-200 F3.5-6.3 DC OS
MF
Asahi Super Takumar 50/1.4
ISCO - Gottingen - BEROLINA TELE WESTANAR 135/3.5
CZ Flektogon 25/4
WELTBLICK Auto Tele 135/2.8
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estudleon
Joined: 15 May 2008
Posts: 3754
Location: Argentina
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| Posted: Sun Oct 05, 2008 4:00 pm Post subject: |
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estudleon wrote:
Better F/'s : 11 and 16 for my 20/4.
If you compose with care (center to the attention at the center, or near, of the image), and not put in the borders distracting things.......
Rino.
_________________
Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
Pentax S-M-C-1,4/50
Helios 44-3
Mamiya 2,8/135
Misc. : jupiter 9
Stuff used:
A) SRL
Alpa 10 D - kern macro Switar 1,9/50 -black, Kilffit apochromat 2/100.
Asahi pentax spotmatic super takumar 1,4/50
Contaflex super B tessar 2,8/50 Pro-tessar 115
Leica R3 electronic summicron 2/50 elmarit 2,8/35
Konica Autoreflex 3 (2 black and chrome one), TC, T4. 2,8/24, 3,5/28 not MC and MC, 1,8/40, 1,4/50, 1,7/50 MC and not MC, 1,8/85, 3,2/135, 3,5/135, 4/200
Minolta XG9 2,8/35, 2/45, 3,5/135
Nikkormat FTn 1,4/50, 2,8/135
Fujica ST 801, 605, 705n. 3,5/19, 1,4/50, 1,8/55, 4/85, 3,5/135.
Praktica MTL 5 and a lot of M42 lenses.
Voigtlander. Bessamatic m, bessamatix de luxe, bessamatic cs, ultramatic and ultramatic cs.
Skoparex 3,5/35, skopagon 2/40, skopar 2,8/50, skopar X 2,8/50, super lanthar (out of catalogue) 2,8/50, dinarex 3,4/90, dinarex 4,8/100, super dinarex 4/135, super dinarex 4/200, zoomar 2,8/36-83, portrait lens 0, 1 and 2. Curtagon 4/28 and 2,8/35
Canon AV1, 1,8/50
Rolleiflex SL35 and SL35 E. 2,8/35 angulon, 2,8/35 distagon, 1,4/55 rolleinar, 1,8/50 planar, 4/135 tessar, 2,8/135 rolleinar, x2 rollei, M42 to rollei adap.
Etc.
RF
Yashica Minister III
Voightlander Vito, vitomatic I, Vito C, etc.
Leica M. M2, M3 (d.s.) and M4. Schenider 3,4/21, 2/35 summaron 2,8/35 (with eyes). Summicron 2/35 (8 elements with eyes), 2/35 chrome, 2/35 black, 1,4/35 pre asph and aspheric - old -, 2/40 summicron, 2,8/50 elmar, 2/50 7 elements, 2/50 DR, 2/50 - minolta version, 1,4/50 summilux 1966 version, 1,4/75 summilux, 2/90 large version, 2/90 reduced version of 1987, 2,8/90 elmarit large version, 4/135 elmar. |
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